/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. 
 */

package org.apache.commons.pipeline;

import java.util.EventListener;
import java.util.EventObject;

/**
 * Listener interface for {@link EventObject}s. Listeners are notified of
 * events by the {@link StageContext} with which they are registered.
 */
public interface StageEventListener extends EventListener {
    
    /**
     * Notify this listener of a {@link StageEvent}
     * @param ev The event to be handled. Listeners should gracefully ignore any events that they
     * do not know how to handle.
     */
    public abstract void notify(EventObject ev);
}
